Abstract
The hysteresis of an array of interacting single domain magnetic particles is studied, where the particles interact via exchange and dipolar interactions. The dependence of the magnetic properties on the distribution of grain sizes, the density of the grains, the anisotropy energy and the exchange interactions in the array is investigated through Monte Carlo simulations for \(\gamma- {\rm Fe_2 O}_3\) nanoparticle systems. We also present some experimental results on the \(\gamma- {\rm Fe_2 O}_3\)-polypyrrole nanocomposite system which agree with the trends observed in our simulations.
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